Capillary Pressure Definition

In TMVOC, is the capillary pressure between two phases i and j:
Pc_ij = Pi - Pj or Pc_ij = Pj - Pi ? where Pi and Pj are the pressures in the phases i and j.

Thank you in advance,


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  • Quentin,

    Capillary pressure is defined negative, i.e., it is the pressure in the wetting phase minus the pressure in the non-wetting phase, i.e., in Pc_ij, i is the non-wetting phase and j the wetting phase, and thus Pc_ij = Pj - Pi.


    • Quentin Giraud
    • PhD Student - Hydrogeology - Contaminated Sites - Modelling
    • Quentin_Giraud
    • 6 yrs ago
    • Reported - view

    Thank you Stefan!

    I was having trouble with the capillary pressure functions and I thought, for ICP=8, that the alpha parameters needed to be entered as negative numbers... I am relieved that I do not need to run all the simulations already done! : )

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